Metal-cutting machine.



No. 735,332.. PATEN'I'ED AUG. 4, 1'903.

J. L. BAGKUS.

METAL GUTTINGMAGHINE.

APPLIGATIN FILED JULY 14, 1902. No-MQDEL.

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"means by which the connection between the Patented August 4,1903.

f-VPATENT QFFICE.

JAMES L. BACKUS, OF AURORA, ILLINOIS.

sPEciFIcArioN forming part of Letteraratent No. 735,332, dated August'4, 1903.

Application filed July 14, 1902.

To @ZZ whom t may concern:

in the county of Kanefand State of Illinois, have invented certain newand useful'lm` provements in Metal-Cutting Machines, of

which the following is aspeciication, reference being had to theaccompanying drawings. n

My invention relates to machines for cutting metal, and particularly tomachines for that purpose in which the cutting is done by a movablecutting-blade carried by a swinging arm which is operated by means of ale-4 ver, the movable blade coacting with a stationary blade to severthe metal. A machine of this character is illustrated and described inpatent to E. IV. Backus and myself, No. 188,089, dated March 6, 1877`-The object of my invention is to provide operating-lever and theswinging arm may be adjusted quickly and without the necesa.` sity ofremoving` Aany of the parts, as has heretofore beenthe case. Heretoforeit has been customary to connect the operatingdever with the'free end ofthe swinging arm by a link, the parts being secured together by means ofa bolt and adjustment provided for by means of a plurality of bolt-holeseither in the link or in the member to which it was attached. Thisnecessitated the removal of the bolt when adjustment was made and wasobjectionable because of Athe time required for the operation. Myinvention provides for the adjustment of the connection instantly`without the removal of any of the parts.

I accomplish the obj ect of my invention as hereinafter describedand asillustrated in the drawings.

` Thatwhich I regard the claims.

Referring to the accompanying drawings, Figure 1 is a partial sideelevation, some parts being in section, illustrating the connectingdevices in one position. Fig. 2 `is a similar as new is set forth inview illustrating the conncotingdevices in another positionand Fig. 3isfan end view of parts of the connecting devices.

In the drawings, 5 indicates the base of the Serial No. 115,495. (Nomodel.)

.maehine, which is of suitable construction to support the partsthereof. p

6 indicates the stationary cutting-blade- V7 indicates a swinging armwhich carries the movable cutting-blade 8. Said arm 7 is portion 9 ofthe frame, preferably by a bolt 10. 11 indicates the operating-lever,and 12 a pair of links by which it is connected with the `swinging arm 7As shown in Fig. 1, the le- `ver'll is mounted on a pivot 13 near theinner end thereof and Lis connected to the links 12 by a pin 14C, whichlies between the pivot -13 and the inner end of the lever. The links "12carry at their opposite ends a pin 15, which passes through a slot 16 inthe outer portion of the swinging arm 7, as best shown in Fig. 1. Asshown, the slot 16 is somewhat U-shaped, the upper and lower endsthereof, which are marked 17 and 18, respectively, lying nearer theadjacent end of said arm than the intermediate portion Of said slot, sothat an inwardly-projecting lug or shoulder 19 is formed between the twoends of said slot. It is evi- `dent, therefore, that when the pin 15lies in 'one end or the other of the slot 16 in order 1 to move ou-t ofits position it must vmove away 4from the-free or outer end of saidswinging arm and that by preventing it from so mov- Ving it may be heldsecurely in position. the purposev of locking the pin 15 in oneend orthe other of said slot 1G a dog 2O1 Ais provided which is mounted on apivot 21, carried `by the swinging arm 7 between the slotlG andytheinner end of said arm, said dog being `adapted to swing down betweenthe pin 15 andthe pivot 21 when said pin lies in either :end ofisaidslot 16, as illustrated in Figs. 1 and 2, thereby preventing the pin 15from -inovingfarther from the outer end of the swinging arm 7 andconsequently locking it in position. The dog 2O carries a finger-piece22, which projects far enoughso that access may readily be had to it forthrowing the dog 2O into or out'of, operative position. In theconstruction shown the finger 22 projects slightly beyond the outer endof the, arm 7, which is shown as being formed of two members d h boltedtogether. (See Fig. 3.) The pin 15 is preferably in the form of a bolt,so

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pivoted at one end to an upwardly-projecting IDO that when it is desiredto take the machine apart it may be readily accomplished; but theadjustment of the'connection between the lever 11 and swinging arm 7does not require the removal of the pin 15.

While I regard the construction illustrated as the best embodiment of myinvention, I do not wish to be limited to the specific arrangementshown, as the parts may be oppositely arrangedthat is to say, the slot16 may be curved in the opposite direction,so that the lug 19 projectsoppositely, in which case the dog 2O would be arranged at the oppositeside of the slot, but the construction shown is preferable because itprovides for locating the pin l5 nearer the outer end of the swingingarm 7. Furthermore, if desired, the slot 16 with the locking mechanismmight be placed in the lower end of the operating-lever instead of inthe swinging arm, but the fulcrum of the operating-lever remaining thesame-that is to say, the operating-lever is fulcrumed in the same manneras hereinbefore set forth.

The modified arrangements suggested are self-evident and therefore arenot illustrated.

In the drawings I have shown a bar 23, the

-function of which is to hold down the outer 25, carried by theprojecting portion 9 of the frame, so that said bar 23 may be verticallyadjusted to accommodate strips of metal of different thicknesses. Thisdevice, however, forms no part of the invention claimed herein.

While I have applied the term curved to the slot 16, it is evident thatthe term is used in a generic sense to imply that the slot does notextend in aright line from one of the positions of the pin to anotherand as used herein it should be understood as including any slot soshaped as to make it necessary for the pin to move laterally or out of aright line in passing from one of its positions in the slot to anotherwhether such form be secured by a curved or by an angular configuration.

My improved connecting device while designed primarily for ametal-cutting machine may be applied to other devices.

That which I claim as my invention, and desire to secure by LettersPatent, is-

1. The combination of a swinging arm provided with a slot, anoperating-lever mounted upon a iiXed pivot, and a link pivoted to thelever and engaging in the slot of the arm for forming a variableconnection between the lever and arm.

2. The combination of a swinging arm having a curved slot near its outerend, a lever for operating said swinging arm, a link connected to saidlever, a pin carried by said link and adapted to move in said slot, andlocking means for preventinglateral movement of said pin in said slot,substantially as described.

3. The combination of a swinging `arm having a curved slot near itsouter end, a lever for operating said swinging arm, a link connected tosaid lever, a pin carried by said link and adapted to move in said slot,and a pivoted dog carried by said swinging arm and adapted to movebetween said pin and the pivot of said dog,to prevent lateral movementof said pin in said slot, substantially as described'.

4. The combination of a swinging arm having a curved slot near its outerend, a lever for operating said swinging arm, a link connected to saidlever, a pin carried by said link and adapted to move in said slot, anda pivoted dog carried by said swinging arm and adapted to move betweensaid pin and the pivot of said dog,to prevent lateral movement of saidpin in said slot, said dog having a projecting iinger, substantially asdescribed.

5. The combination of a swinging arm having a curved slot near its outerend, an inwardly-projecting lug between the ends of said slot,a pivotedoperating-lever,a link connecting said lever with said swinging arm,said link having a pin adapted to move in said slot, and a lockingdevice carried by said arm, for preventing said pin from moving in saidslot by said lug, substantially as described.

6. The combination of' a swinging arm having a curved slot near itsouter end, an inwardly-projecting lug between the ends of said slot,apivoted operating-lever,a link connecting said lever with said swingingarm, said link having a pin adapted to move in said slot, and a pivoteddog carried by said swinging arm, said dog being adapted to move betweensaid pin and the pivot of said dog, to prevent said pin from movingbysaid lug when the pin lies in either end of said slot, substantiallyas described.

. JAMES L. BACKUS. Witnesses;

ROBERT T. RUBLE, H. A. WEBB.

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